Hystrichosphaeridium xanthiopyxides var. parvispinum
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"var. parvispinum" Deflandre, 1937b, p.77, pl.16 (al. pl.13), fig.5. Holotype: pl.16 (al. pl.13), fig.5; Fauconnier and Masure, 2004, pl.66, figs.5–6. NOW Prolixosphaeridium parvispinum. Originally Hystrichosphaeridium? xanthiopyxides var. parvispinum, subsequently Hystrichosphaeridium parvispinum, thirdly Baltisphaeridium parvispinum (Appendix A), fourthly (and now) Prolixosphaeridium parvispinum. Taxonomic junior synonyms (at specific and varietal ranks): Prolixosphaeridium elongatum, according to Lentin and Williams (1985, p.294); Prolixosphaeridium deirense, according to Davey and Verdier (1974, p.636–637) — however, Harding (1990b, p.46) retained Prolixosphaeridium deirense. Age: late Aptian.
Parent: Hystrichosphaeridium xanthiopyxides